Monday, 21 December 2015

TYPES OF GRINDING PROCESS

TYPES OF GRINDING PROCESS

We were discussing “Basic Principle of grinding” in
our previous post, where we have discussed the fundamentals of grinding
process, abrasives materials and various factors affecting the work piece
surface created by grinding process.

Today we will continue with the classifications of
grinding process, applications of grinding process and finally we will see the
advantage of grinding process. So let us see the various classifications of
grinding process.

There are mostly four types of grinding processes used
in industries and these are as mentioned here, we will discuss each type of
grinding process in details here.

Cylindrical grinding

Cylindrical grinding process is used to shape the
outer surface of a workpiece. Cylindrical grinding process is mostly used to
grind the surface of cylindrical object. Object will rotate around one axis and
the surfaces of object which need to be grinded will be in concentric with that
axis around which workpiece will rotate.Following figure shows the cylindrical grinding.

Cylindrical
grinder will have one wheelhead attached with spindle and motor and this
wheelhead will move to and from object with the help of cross slide. Tailstock
and headstock will hold the object and object will rotate between headstock and
tailstock.

Also read

Inside diameter grinding

Inside diameter grinding, also called as internal
grinding, is used for grinding the inner diameter of tubular object. Workpiece
or object will have already drilled hole and internal grinding process will be
performed to finish the inner surface of workpiece with the help of small
grinding wheel rotating at higher revolution per minute. Internal grinding
process is displayed in following figure.

Workpiece will be hold in 3 jaw or 4 jaw chuck and workpiece
will rotate by rotating motion of chuck. Internal grinder wheel will be attached
with internal grinder spindle. Internal grinder will have rotating motion and
will also have transverse motion to grind the internal surface of workpiece thoroughly.

Centerless grinding

Centerless grinding, as shown in figure, will be
performed by locating the workpiece between one grinding wheel and one regulating
wheel. Workpiece will be supported with the help of one guide or stop as shown
in figure. There are three basic types of centerless grinding process as
mentioned below

Through-feed grinding

In-feed grinding

End-feed grinding

Through- feed grinding

In through feed grinding, workpiece will be feed axially
by the axial force exerted on workpiece and this axial force will be applied by
rotating surface of regulating wheel. Through feed grinding process is
considered as quite productive as grinding process could be performed
simultaneously for number of objects.

In-feed grinding

In-feed grinding is different from through-feed
grinding process. If we have a workpiece, which has not exactly not right
circular cylindrical shape, in this situation we will prefer in-feed grinding
process as grinding wheel could be dressed according to the workpiece surface.
Grinding wheel will be feed in radial direction in case of in-feed grinding
process. In-feed grinding consumes lots of time in preparation, hence in-feed
grinding has lower productivity as compared to through-feed grinding.

End –feed grinding

In end-feed grinding process, workpiece will
advanced in axial direction. Workpiece will be stopped for grinding process and
after that workpiece will move again.

Surface grinding

Surface grinding process is used for grinding and precise
finishing the flat surfaces. Grinding wheel will rotate and workpiece will be
feed in horizontal direction, below the grinding wheel, with the help of fed
table. Surface grinding process is shown below in figure.